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Jason Rumney authored
[HAVE_PNG]: Sync with xfns.c version. (png_load): Adjust colors for Windows. Use Windows bitmaps. Disable color table lookups. (DEF_IMGLIB_FN, LOAD_IMGLIB_FN): New macros. (init_png_functions): New function. (png_read_from_memory, png_load): Call png library functions through pointers determined at runtime. (QCloader, QCbounding_box, QCpt_width, QCpt_height): Declare. (init_external_image_libraries): New function. (init_xfns): Call it.
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